fix(makefile): allow help target to be used with custom makefile name

src/makefile/basic.mk

@@ -44,7 +44,7 @@ CONDA := source $(SERVER_CONDA_PATH)/etc/profile.d/conda.sh && conda
 default: help # customize, if you know what you're doing
 
 help: # list targets and usage
-	@awk '/^[a-zA-Z0-9_-]+:/{print $1}' makefile
+	@awk '/^[a-zA-Z0-9_-]+:/{print $1}' $(lastword $(MAKEFILE_LIST))
 
 install: # install conda environment
 	$(SSH) '\